21935293 has 2 divisors, whose sum is σ = 21935294. Its totient is φ = 21935292.

The previous prime is 21935279. The next prime is 21935297. The reversal of 21935293 is 39253912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20775364 + 1159929 = 4558^2 + 1077^2 .

It is a cyclic number.

It is not a de Polignac number, because 21935293 - 2²¹ = 19838141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21935297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10967646 + 10967647.

It is an arithmetic number, because the mean of its divisors is an integer number (10967647).

Almost surely, 2^21935293 is an apocalyptic number.

It is an amenable number.

21935293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21935293 is an equidigital number, since it uses as much as digits as its factorization.

21935293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 34.

The square root of 21935293 is about 4683.5128909826. The cubic root of 21935293 is about 279.9289488087.

The spelling of 21935293 in words is "twenty-one million, nine hundred thirty-five thousand, two hundred ninety-three".